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Instead of failing with EINVAL when setthrname(2) is passed a thread

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name longer then _MAXCOMLEN-1, truncate the name to fit. This is likely
what the user wants and saves them from having to snprintf(3) into a
buffer sized _MAXCOMLEN first. Man page update to follow.

This makes pthread_set_name_np(3) succeed with long thread names
instead of silently failing.

ok deraadt@ miod@ sthen@ mpi@
This commit is contained in:
kurt
2025-12-03 17:05:53 +00:00
parent 4ae131efb0
commit 75e4855f27
1 changed files with 5 additions and 3 deletions
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8
sys/kern/kern_prot.c
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@@ -1,4 +1,4 @@
/* $OpenBSD: kern_prot.c,v 1.83 2024/10/08 09:05:40 claudio Exp $ */
/* $OpenBSD: kern_prot.c,v 1.84 2025/12/03 17:05:53 kurt Exp $ */
/* $NetBSD: kern_prot.c,v 1.33 1996/02/09 18:59:42 christos Exp $ */
/*
@@ -1157,10 +1157,12 @@ sys_setthrname(struct proc *curp, void *v, register_t *retval)
return ESRCH;
error = copyinstr(SCARG(uap, name), buf, sizeof buf, NULL);
if (error == ENAMETOOLONG) {
buf[sizeof(buf) - 1] = '\0';
error = 0;
}
if (error == 0)
strlcpy(p->p_name, buf, sizeof(p->p_name));
else if (error == ENAMETOOLONG)
error = EINVAL;
*retval = error;
return 0;
}